drm/amd/display: Fix off by one in hdmi_14_process_transaction()

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The hdcp_i2c_offsets[] array did not have an entry for
HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE so it led to an off by one
read overflow.  I added an entry and copied the 0x0 value for the offset
from similar code in drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c.

I also declared several of these arrays as having HDCP_MESSAGE_ID_MAX
entries.  This doesn't change the code, but it's just a belt and
suspenders approach to try future proof the code.

Fixes: 4c283fdac0 ("drm/amd/display: Add HDCP module")
Reviewed-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Dan Carpenter 2021-03-02 14:15:48 +03:00 • committed by Alex Deucher

parent 8dbc2ccac5

commit 8e6fafd5a2

1 changed files with 5 additions and 4 deletions

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drivers/gpu/drm/amd/display/dc/hdcp/hdcp_msg.c

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